Ports the MIT-licensed 'wizard' skill from mattpocock/skills as
setup-wizard-generator (optional-skills/devops). Generates an interactive
bash wizard that walks a human through manual procedures: opens dashboard
URLs, captures values (hidden entry for secrets), writes .env / GitHub
secrets idempotently, and confirms each stage. Vendors upstream's
template.sh library verbatim (bash -n verified) plus a staging test suite
covering frontmatter, template integrity, and de-upstreaming.
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